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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">median_image</span><span data-if="c" style="display:none;">median_image</span><span data-if="cpp" style="display:none;">MedianImage</span><span data-if="dotnet" style="display:none;">MedianImage</span><span data-if="python" style="display:none;">median_image</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">median_image</span><span data-if="c" style="display:none;">median_image</span><span data-if="cpp" style="display:none;">MedianImage</span><span data-if="dotnet" style="display:none;">MedianImage</span><span data-if="python" style="display:none;">median_image</span></code> — Compute a median filter with various masks.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>median_image</b>(<a href="#Image"><i>Image</i></a> : <a href="#ImageMedian"><i>ImageMedian</i></a> : <a href="#MaskType"><i>MaskType</i></a>, <a href="#Radius"><i>Radius</i></a>, <a href="#Margin"><i>Margin</i></a> : )</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>median_image</b>(const Hobject <a href="#Image"><i>Image</i></a>, Hobject* <a href="#ImageMedian"><i>ImageMedian</i></a>, const char* <a href="#MaskType"><i>MaskType</i></a>, const Hlong <a href="#Radius"><i>Radius</i></a>, const char* <a href="#Margin"><i>Margin</i></a>)</code></p>
<p>
<code>Herror <b>T_median_image</b>(const Hobject <a href="#Image"><i>Image</i></a>, Hobject* <a href="#ImageMedian"><i>ImageMedian</i></a>, const Htuple <a href="#MaskType"><i>MaskType</i></a>, const Htuple <a href="#Radius"><i>Radius</i></a>, const Htuple <a href="#Margin"><i>Margin</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>MedianImage</b>(const HObject&amp; <a href="#Image"><i>Image</i></a>, HObject* <a href="#ImageMedian"><i>ImageMedian</i></a>, const HTuple&amp; <a href="#MaskType"><i>MaskType</i></a>, const HTuple&amp; <a href="#Radius"><i>Radius</i></a>, const HTuple&amp; <a href="#Margin"><i>Margin</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>MedianImage</b>(const HString&amp; <a href="#MaskType"><i>MaskType</i></a>, Hlong <a href="#Radius"><i>Radius</i></a>, const HTuple&amp; <a href="#Margin"><i>Margin</i></a>) const</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>MedianImage</b>(const HString&amp; <a href="#MaskType"><i>MaskType</i></a>, Hlong <a href="#Radius"><i>Radius</i></a>, const HString&amp; <a href="#Margin"><i>Margin</i></a>) const</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>MedianImage</b>(const char* <a href="#MaskType"><i>MaskType</i></a>, Hlong <a href="#Radius"><i>Radius</i></a>, const char* <a href="#Margin"><i>Margin</i></a>) const</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>MedianImage</b>(const wchar_t* <a href="#MaskType"><i>MaskType</i></a>, Hlong <a href="#Radius"><i>Radius</i></a>, const wchar_t* <a href="#Margin"><i>Margin</i></a>) const  <span class="signnote">
            (
            Windows only)
          </span></code></p>
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<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>MedianImage</b>(<a href="HObject.html">HObject</a> <a href="#Image"><i>image</i></a>, out <a href="HObject.html">HObject</a> <a href="#ImageMedian"><i>imageMedian</i></a>, <a href="HTuple.html">HTuple</a> <a href="#MaskType"><i>maskType</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Radius"><i>radius</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Margin"><i>margin</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>.<b>MedianImage</b>(string <a href="#MaskType"><i>maskType</i></a>, int <a href="#Radius"><i>radius</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Margin"><i>margin</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>.<b>MedianImage</b>(string <a href="#MaskType"><i>maskType</i></a>, int <a href="#Radius"><i>radius</i></a>, string <a href="#Margin"><i>margin</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>median_image</b>(<a href="#Image"><i>image</i></a>: HObject, <a href="#MaskType"><i>mask_type</i></a>: str, <a href="#Radius"><i>radius</i></a>: int, <a href="#Margin"><i>margin</i></a>: Union[int, float, str]) -&gt; HObject</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p><code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> performs a median filter on the input image
<a href="#Image"><i><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></i></a> with a square or circular mask and returns the
filtered image in <a href="#ImageMedian"><i><code><span data-if="hdevelop" style="display:inline">ImageMedian</span><span data-if="c" style="display:none">ImageMedian</span><span data-if="cpp" style="display:none">ImageMedian</span><span data-if="com" style="display:none">ImageMedian</span><span data-if="dotnet" style="display:none">imageMedian</span><span data-if="python" style="display:none">image_median</span></code></i></a>. The shape of the mask can
be selected with <a href="#MaskType"><i><code><span data-if="hdevelop" style="display:inline">MaskType</span><span data-if="c" style="display:none">MaskType</span><span data-if="cpp" style="display:none">MaskType</span><span data-if="com" style="display:none">MaskType</span><span data-if="dotnet" style="display:none">maskType</span><span data-if="python" style="display:none">mask_type</span></code></i></a>. The radius of the mask can be
selected with <a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a>.
</p>
<p>Conceptually, the median filter sorts all gray values within the
mask in ascending order and then selects the median of the gray
values.  The median is the “middle” one of the sorted gray values,
i.e., the gray value with rank (position) (N - 1) / 2 + 1 of the
sorted gray values, where N denotes the number of pixels covered by
the filter mask.
Here, the rank 1 corresponds to the smallest gray value and the rank N
corresponds to the largest gray value within the mask (see also
<a href="rank_image.html"><code><span data-if="hdevelop" style="display:inline">rank_image</span><span data-if="c" style="display:none">rank_image</span><span data-if="cpp" style="display:none">RankImage</span><span data-if="com" style="display:none">RankImage</span><span data-if="dotnet" style="display:none">RankImage</span><span data-if="python" style="display:none">rank_image</span></code></a>).
</p>
<p>The filter mask is determined by <a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a>, defining the size, and
<a href="#MaskType"><i><code><span data-if="hdevelop" style="display:inline">MaskType</span><span data-if="c" style="display:none">MaskType</span><span data-if="cpp" style="display:none">MaskType</span><span data-if="com" style="display:none">MaskType</span><span data-if="dotnet" style="display:none">maskType</span><span data-if="python" style="display:none">mask_type</span></code></i></a>, defining the shape of the mask.
For latter one, the following options are available:
</p>
<ul>
<li>
<p> <i><span data-if="hdevelop" style="display:inline">'circle'</span><span data-if="c" style="display:none">"circle"</span><span data-if="cpp" style="display:none">"circle"</span><span data-if="com" style="display:none">"circle"</span><span data-if="dotnet" style="display:none">"circle"</span><span data-if="python" style="display:none">"circle"</span></i>: The mask consists of the pixel within a circle
with <a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a> around the pixel of the mask center.
</p>
</li>
<li>
<p> <i><span data-if="hdevelop" style="display:inline">'square'</span><span data-if="c" style="display:none">"square"</span><span data-if="cpp" style="display:none">"square"</span><span data-if="com" style="display:none">"square"</span><span data-if="dotnet" style="display:none">"square"</span><span data-if="python" style="display:none">"square"</span></i>: The mask consists of the pixel within a square
with an edge length of
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  <g transform="matrix(1.600006,-0.000000,-0.000000,1.600006,12.000397 11.403702)" style="fill: rgb(0.000000%,0.000000%,0.000000%);">
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  </g>
</svg></span><a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a> <span title="2" style="vertical-align:-0.0877304em" class="math"><!-- Created by MetaPost 1.902 on 2023.05.15:2033 --><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="1.43509em" height="0.800462em" viewBox="0 0 22.961365 12.807388">
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</svg></span> pixel.
</p>
</li>
</ul>
<p><code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> can be used, for example, to smooth images, to
suppress unwanted objects (e.g., point-like or line-like structures)
that are smaller than the mask, and can therefore be used to
estimate the background illumination for a shading correction or as
a preprocessing step for the dynamic threshold operation (see
<a href="dyn_threshold.html"><code><span data-if="hdevelop" style="display:inline">dyn_threshold</span><span data-if="c" style="display:none">dyn_threshold</span><span data-if="cpp" style="display:none">DynThreshold</span><span data-if="com" style="display:none">DynThreshold</span><span data-if="dotnet" style="display:none">DynThreshold</span><span data-if="python" style="display:none">dyn_threshold</span></code></a>).
</p>
<p>Several border treatments can be chosen for filtering via the
parameter <a href="#Margin"><i><code><span data-if="hdevelop" style="display:inline">Margin</span><span data-if="c" style="display:none">Margin</span><span data-if="cpp" style="display:none">Margin</span><span data-if="com" style="display:none">Margin</span><span data-if="dotnet" style="display:none">margin</span><span data-if="python" style="display:none">margin</span></code></i></a>:
</p>
<ul>
<li>
<p> gray value:  Pixels outside of the image borders are assumed to
be constant (with the specified gray value).
</p>
</li>
<li>
<p> <i><span data-if="hdevelop" style="display:inline">'continued'</span><span data-if="c" style="display:none">"continued"</span><span data-if="cpp" style="display:none">"continued"</span><span data-if="com" style="display:none">"continued"</span><span data-if="dotnet" style="display:none">"continued"</span><span data-if="python" style="display:none">"continued"</span></i>: Continuation of border pixels.
</p>
</li>
<li>
<p> <i><span data-if="hdevelop" style="display:inline">'cyclic'</span><span data-if="c" style="display:none">"cyclic"</span><span data-if="cpp" style="display:none">"cyclic"</span><span data-if="com" style="display:none">"cyclic"</span><span data-if="dotnet" style="display:none">"cyclic"</span><span data-if="python" style="display:none">"cyclic"</span></i>: Cyclic continuation of image borders.
</p>
</li>
<li>
<p> <i><span data-if="hdevelop" style="display:inline">'mirrored'</span><span data-if="c" style="display:none">"mirrored"</span><span data-if="cpp" style="display:none">"mirrored"</span><span data-if="com" style="display:none">"mirrored"</span><span data-if="dotnet" style="display:none">"mirrored"</span><span data-if="python" style="display:none">"mirrored"</span></i>: Reflection of pixels at the image borders.
</p>
</li>
</ul>
<p>When using the <a href="#MaskType"><i><code><span data-if="hdevelop" style="display:inline">MaskType</span><span data-if="c" style="display:none">MaskType</span><span data-if="cpp" style="display:none">MaskType</span><span data-if="com" style="display:none">MaskType</span><span data-if="dotnet" style="display:none">maskType</span><span data-if="python" style="display:none">mask_type</span></code></i></a> <i><span data-if="hdevelop" style="display:inline">'square'</span><span data-if="c" style="display:none">"square"</span><span data-if="cpp" style="display:none">"square"</span><span data-if="com" style="display:none">"square"</span><span data-if="dotnet" style="display:none">"square"</span><span data-if="python" style="display:none">"square"</span></i> with <a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a> 1 or 2
(resulting in a 3x3 or 5x5 pixel filter mask) and the border treatment
'mirrored', <code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> can be executed on OpenCL devices.
</p>
<p>For an explanation of the concept of smoothing filters see the introduction
of chapter <a href="toc_filters_smoothing.html">Filters / Smoothing</a>.</p>
<h2 id="sec_attention">注意</h2>
<p><code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> uses an algorithm with a runtime per pixel that
depends on the mask height 2 *
<a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a> + 1.  Therefore, <code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> is slower
than <a href="median_rect.html"><code><span data-if="hdevelop" style="display:inline">median_rect</span><span data-if="c" style="display:none">median_rect</span><span data-if="cpp" style="display:none">MedianRect</span><span data-if="com" style="display:none">MedianRect</span><span data-if="dotnet" style="display:none">MedianRect</span><span data-if="python" style="display:none">median_rect</span></code></a> for square masks with a large mask height.
The precise mask height for which <a href="median_rect.html"><code><span data-if="hdevelop" style="display:inline">median_rect</span><span data-if="c" style="display:none">median_rect</span><span data-if="cpp" style="display:none">MedianRect</span><span data-if="com" style="display:none">MedianRect</span><span data-if="dotnet" style="display:none">MedianRect</span><span data-if="python" style="display:none">median_rect</span></code></a> will become
faster than <code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> depends on the computer
architecture (processor type, availability of SIMD instructions like
SSE2 or MMX, cache size and throughput, memory throughput).
Typically, this is the case for mask heights &gt; 15, but can also be
the case only for larger mask sizes, e.g., if SIMD instructions are
unavailable and memory throughput is low.
</p>
<p>Furthermore, it should be noted that <a href="median_rect.html"><code><span data-if="hdevelop" style="display:inline">median_rect</span><span data-if="c" style="display:none">median_rect</span><span data-if="cpp" style="display:none">MedianRect</span><span data-if="com" style="display:none">MedianRect</span><span data-if="dotnet" style="display:none">MedianRect</span><span data-if="python" style="display:none">median_rect</span></code></a> uses a
recursive implementation, which internally computes the filter
response on the smallest enclosing rectangle of the domain of the
input image.  Therefore, if the domain of the input image only
covers a small fraction of the smallest enclosing rectangle, it can
happen that <code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> is faster than <a href="median_rect.html"><code><span data-if="hdevelop" style="display:inline">median_rect</span><span data-if="c" style="display:none">median_rect</span><span data-if="cpp" style="display:none">MedianRect</span><span data-if="com" style="display:none">MedianRect</span><span data-if="dotnet" style="display:none">MedianRect</span><span data-if="python" style="display:none">median_rect</span></code></a>
even for larger mask heights.
</p>
<p>Due to performance reasons, the input <a href="#Image"><i><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></i></a> is not checked whether
it contains NaNs. Using an input image with NaNs crashes HALCON.
</p>
<p>Note that filter operators may return unexpected results if
an image with a reduced domain is used as input. Please refer to the
chapter <a href="toc_filters.html">过滤器</a>.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
    
      <li>支持OpenCL计算设备。</li>
    
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  
    <li>在元组级别自动并行化。</li>
    <li>在图像通道级别自动并行化。</li>
    <li>Automatically parallelized on  domain level.</li>
  
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="Image" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Image</span><span data-if="c" style="display:none">Image</span><span data-if="cpp" style="display:none">Image</span><span data-if="com" style="display:none">Image</span><span data-if="dotnet" style="display:none">image</span><span data-if="python" style="display:none">image</span></code></b> (input_object)  </span><span>(multichannel-)image(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (byte* / int2* / uint2* / int4* / real*)<i> *allowed for compute devices</i></span>
</div>
<p class="pardesc">Image to be filtered.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="ImageMedian" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ImageMedian</span><span data-if="c" style="display:none">ImageMedian</span><span data-if="cpp" style="display:none">ImageMedian</span><span data-if="com" style="display:none">ImageMedian</span><span data-if="dotnet" style="display:none">imageMedian</span><span data-if="python" style="display:none">image_median</span></code></b> (output_object)  </span><span>(multichannel-)image(-array) <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject *</span> (byte / int2 / uint2 / int4 / real)</span>
</div>
<p class="pardesc">Filtered image.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="MaskType" class="parname"><b><code><span data-if="hdevelop" style="display:inline">MaskType</span><span data-if="c" style="display:none">MaskType</span><span data-if="cpp" style="display:none">MaskType</span><span data-if="com" style="display:none">MaskType</span><span data-if="dotnet" style="display:none">maskType</span><span data-if="python" style="display:none">mask_type</span></code></b> (input_control)  </span><span>string <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">str</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">Filter mask type.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'circle'</span>
    <span data-if="c" style="display:none">"circle"</span>
    <span data-if="cpp" style="display:none">"circle"</span>
    <span data-if="com" style="display:none">"circle"</span>
    <span data-if="dotnet" style="display:none">"circle"</span>
    <span data-if="python" style="display:none">"circle"</span>
</p>
<p class="pardesc"><span class="parcat">List of values:
      </span><span data-if="hdevelop" style="display:inline">'circle'</span><span data-if="c" style="display:none">"circle"</span><span data-if="cpp" style="display:none">"circle"</span><span data-if="com" style="display:none">"circle"</span><span data-if="dotnet" style="display:none">"circle"</span><span data-if="python" style="display:none">"circle"</span>, <span data-if="hdevelop" style="display:inline">'square'</span><span data-if="c" style="display:none">"square"</span><span data-if="cpp" style="display:none">"square"</span><span data-if="com" style="display:none">"square"</span><span data-if="dotnet" style="display:none">"square"</span><span data-if="python" style="display:none">"square"</span></p>
<p class="pardesc"><span class="parcat">List of values (for compute devices):
      </span><span data-if="hdevelop" style="display:inline">'square'</span><span data-if="c" style="display:none">"square"</span><span data-if="cpp" style="display:none">"square"</span><span data-if="com" style="display:none">"square"</span><span data-if="dotnet" style="display:none">"square"</span><span data-if="python" style="display:none">"square"</span></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Radius" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Radius of the filter mask.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>1</p>
<p class="pardesc"><span class="parcat">List of values (for compute devices):
      </span>1, 2</p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span>1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 15, 19, 25, 31, 39, 47, 59</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>1
          ≤
        
    <span data-if="hdevelop" style="display:inline">Radius</span>
    <span data-if="c" style="display:none">Radius</span>
    <span data-if="cpp" style="display:none">Radius</span>
    <span data-if="com" style="display:none">Radius</span>
    <span data-if="dotnet" style="display:none">radius</span>
    <span data-if="python" style="display:none">radius</span>
    
          ≤
          4095</code></p>
<p class="pardesc"><span class="parcat">Minimum increment:
      </span>1</p>
<p class="pardesc"><span class="parcat">Recommended increment:
      </span>2</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Margin" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Margin</span><span data-if="c" style="display:none">Margin</span><span data-if="cpp" style="display:none">Margin</span><span data-if="com" style="display:none">Margin</span><span data-if="dotnet" style="display:none">margin</span><span data-if="python" style="display:none">margin</span></code></b> (input_control)  </span><span>string <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Union[int, float, str]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string / </span><span data-if="hdevelop" style="display:inline">integer / </span><span data-if="hdevelop" style="display:inline">real)</span><span data-if="dotnet" style="display:none"> (<i>string</i> / </span><span data-if="dotnet" style="display:none">int / </span><span data-if="dotnet" style="display:none">long / </span><span data-if="dotnet" style="display:none">double)</span><span data-if="cpp" style="display:none"> (<i>HString</i> / </span><span data-if="cpp" style="display:none">Hlong / </span><span data-if="cpp" style="display:none">double)</span><span data-if="c" style="display:none"> (<i>char*</i> / </span><span data-if="c" style="display:none">Hlong / </span><span data-if="c" style="display:none">double)</span></span>
</div>
<p class="pardesc">Border treatment.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'mirrored'</span>
    <span data-if="c" style="display:none">"mirrored"</span>
    <span data-if="cpp" style="display:none">"mirrored"</span>
    <span data-if="com" style="display:none">"mirrored"</span>
    <span data-if="dotnet" style="display:none">"mirrored"</span>
    <span data-if="python" style="display:none">"mirrored"</span>
</p>
<p class="pardesc"><span class="parcat">List of values (for compute devices):
      </span><span data-if="hdevelop" style="display:inline">'mirrored'</span><span data-if="c" style="display:none">"mirrored"</span><span data-if="cpp" style="display:none">"mirrored"</span><span data-if="com" style="display:none">"mirrored"</span><span data-if="dotnet" style="display:none">"mirrored"</span><span data-if="python" style="display:none">"mirrored"</span></p>
<p class="pardesc"><span class="parcat">Suggested values:
      </span><span data-if="hdevelop" style="display:inline">'mirrored'</span><span data-if="c" style="display:none">"mirrored"</span><span data-if="cpp" style="display:none">"mirrored"</span><span data-if="com" style="display:none">"mirrored"</span><span data-if="dotnet" style="display:none">"mirrored"</span><span data-if="python" style="display:none">"mirrored"</span>, <span data-if="hdevelop" style="display:inline">'cyclic'</span><span data-if="c" style="display:none">"cyclic"</span><span data-if="cpp" style="display:none">"cyclic"</span><span data-if="com" style="display:none">"cyclic"</span><span data-if="dotnet" style="display:none">"cyclic"</span><span data-if="python" style="display:none">"cyclic"</span>, <span data-if="hdevelop" style="display:inline">'continued'</span><span data-if="c" style="display:none">"continued"</span><span data-if="cpp" style="display:none">"continued"</span><span data-if="com" style="display:none">"continued"</span><span data-if="dotnet" style="display:none">"continued"</span><span data-if="python" style="display:none">"continued"</span>, 0, 30, 60, 90, 120, 150, 180, 210, 240, 255</p>
</div>
<h2 id="sec_example_all">例程 (HDevelop)</h2>
<pre class="example">
read_image (Image, 'fabrik')
median_image (Image, Median, 'circle', 3, 'continued')
dev_display(Median)
</pre>
<h2 id="sec_complexity">Complexity</h2>
<p>For each pixel: O(2 *
<a href="#Radius"><i><code><span data-if="hdevelop" style="display:inline">Radius</span><span data-if="c" style="display:none">Radius</span><span data-if="cpp" style="display:none">Radius</span><span data-if="com" style="display:none">Radius</span><span data-if="dotnet" style="display:none">radius</span><span data-if="python" style="display:none">radius</span></code></i></a> + 1).</p>
<h2 id="sec_result">结果</h2>
<p>If the parameter values are correct 该算子
<code><span data-if="hdevelop" style="display:inline">median_image</span><span data-if="c" style="display:none">median_image</span><span data-if="cpp" style="display:none">MedianImage</span><span data-if="com" style="display:none">MedianImage</span><span data-if="dotnet" style="display:none">MedianImage</span><span data-if="python" style="display:none">median_image</span></code> 返回值 <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
    .  The behavior in case
of empty input (no input images available) is set via 该算子
<a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('no_object_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.  If necessary, an
exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="read_image.html"><span data-if="hdevelop" style="display:inline">read_image</span><span data-if="c" style="display:none">read_image</span><span data-if="cpp" style="display:none">ReadImage</span><span data-if="com" style="display:none">ReadImage</span><span data-if="dotnet" style="display:none">ReadImage</span><span data-if="python" style="display:none">read_image</span></a></code>
</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>, 
<code><a href="dyn_threshold.html"><span data-if="hdevelop" style="display:inline">dyn_threshold</span><span data-if="c" style="display:none">dyn_threshold</span><span data-if="cpp" style="display:none">DynThreshold</span><span data-if="com" style="display:none">DynThreshold</span><span data-if="dotnet" style="display:none">DynThreshold</span><span data-if="python" style="display:none">dyn_threshold</span></a></code>, 
<code><a href="regiongrowing.html"><span data-if="hdevelop" style="display:inline">regiongrowing</span><span data-if="c" style="display:none">regiongrowing</span><span data-if="cpp" style="display:none">Regiongrowing</span><span data-if="com" style="display:none">Regiongrowing</span><span data-if="dotnet" style="display:none">Regiongrowing</span><span data-if="python" style="display:none">regiongrowing</span></a></code>
</p>
<h2 id="sec_alternatives">可替代算子</h2>
<p>
<code><a href="median_rect.html"><span data-if="hdevelop" style="display:inline">median_rect</span><span data-if="c" style="display:none">median_rect</span><span data-if="cpp" style="display:none">MedianRect</span><span data-if="com" style="display:none">MedianRect</span><span data-if="dotnet" style="display:none">MedianRect</span><span data-if="python" style="display:none">median_rect</span></a></code>, 
<code><a href="rank_image.html"><span data-if="hdevelop" style="display:inline">rank_image</span><span data-if="c" style="display:none">rank_image</span><span data-if="cpp" style="display:none">RankImage</span><span data-if="com" style="display:none">RankImage</span><span data-if="dotnet" style="display:none">RankImage</span><span data-if="python" style="display:none">rank_image</span></a></code>, 
<code><a href="rank_rect.html"><span data-if="hdevelop" style="display:inline">rank_rect</span><span data-if="c" style="display:none">rank_rect</span><span data-if="cpp" style="display:none">RankRect</span><span data-if="com" style="display:none">RankRect</span><span data-if="dotnet" style="display:none">RankRect</span><span data-if="python" style="display:none">rank_rect</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="gray_erosion_rect.html"><span data-if="hdevelop" style="display:inline">gray_erosion_rect</span><span data-if="c" style="display:none">gray_erosion_rect</span><span data-if="cpp" style="display:none">GrayErosionRect</span><span data-if="com" style="display:none">GrayErosionRect</span><span data-if="dotnet" style="display:none">GrayErosionRect</span><span data-if="python" style="display:none">gray_erosion_rect</span></a></code>, 
<code><a href="gray_dilation_rect.html"><span data-if="hdevelop" style="display:inline">gray_dilation_rect</span><span data-if="c" style="display:none">gray_dilation_rect</span><span data-if="cpp" style="display:none">GrayDilationRect</span><span data-if="com" style="display:none">GrayDilationRect</span><span data-if="dotnet" style="display:none">GrayDilationRect</span><span data-if="python" style="display:none">gray_dilation_rect</span></a></code>, 
<code><a href="gray_erosion_shape.html"><span data-if="hdevelop" style="display:inline">gray_erosion_shape</span><span data-if="c" style="display:none">gray_erosion_shape</span><span data-if="cpp" style="display:none">GrayErosionShape</span><span data-if="com" style="display:none">GrayErosionShape</span><span data-if="dotnet" style="display:none">GrayErosionShape</span><span data-if="python" style="display:none">gray_erosion_shape</span></a></code>, 
<code><a href="gray_dilation_shape.html"><span data-if="hdevelop" style="display:inline">gray_dilation_shape</span><span data-if="c" style="display:none">gray_dilation_shape</span><span data-if="cpp" style="display:none">GrayDilationShape</span><span data-if="com" style="display:none">GrayDilationShape</span><span data-if="dotnet" style="display:none">GrayDilationShape</span><span data-if="python" style="display:none">gray_dilation_shape</span></a></code>, 
<code><a href="gray_erosion.html"><span data-if="hdevelop" style="display:inline">gray_erosion</span><span data-if="c" style="display:none">gray_erosion</span><span data-if="cpp" style="display:none">GrayErosion</span><span data-if="com" style="display:none">GrayErosion</span><span data-if="dotnet" style="display:none">GrayErosion</span><span data-if="python" style="display:none">gray_erosion</span></a></code>, 
<code><a href="gray_dilation.html"><span data-if="hdevelop" style="display:inline">gray_dilation</span><span data-if="c" style="display:none">gray_dilation</span><span data-if="cpp" style="display:none">GrayDilation</span><span data-if="com" style="display:none">GrayDilation</span><span data-if="dotnet" style="display:none">GrayDilation</span><span data-if="python" style="display:none">gray_dilation</span></a></code>
</p>
<h2 id="sec_references">References</h2>
<p>

T.S. Huang, G.J. Yang, G.Y. Tang; “A Fast Two-Dimensional Median
Filtering Algorithm”; IEEE Transactions on Acoustics, Speech, and
Signal Processing, vol. 27, no. 1, pp. 13-18, 1979.
<br>
R. Haralick, L. Shapiro; “Computer and Robot Vision”;
Addison-Wesley, 1992, pp. 318-320.
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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